#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
	ULL N, M;
	if (N >= M) cout << 0 << endl;
	else {
		ULL ans = 1;
		for (ULL i = 1; i <= N; i++)
			ans = ans * i % M;
		cout << ans << endl;
	}
	return 0;
}